Cisco 8821 Administration Manual page 122

General Troubleshooting Information
Summary
Phone firmware downgrades
Battery life is shorter than
specified
Phone call cannot be established
Call established with the iLBC
protocol does not show that the
iLBC codec is being used
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager
112
Explanation
After applying a Cisco Unified Communications Manager upgrade or
patch, that is older than the current phone firmware, the phones could
automatically downgrade to the load contained in the patch. Check the
phone default image in the TFTP folder to fix this problem.
An unstable RF environment can cause the phone to remain in active mode
because it is constantly seeking an AP. This reduces the battery life
considerably. When leaving an area of coverage, shut down the phone.
Higher phone transmit power can affect battery life.
To maximize idle time on the phone and conserve battery life, you need
to optimize the registration time so the phone can go into power save mode
more often.
The phone does not have a DHCP IP address, is unable to register to Cisco
Unified Communications Manager, and shows a Configuring IP or
Registering message.
Verify the following:
1 The Cisco Unified Communications Manager service is running on
the Cisco Unified Communications Manager server.
2 Both phones are registered to the same Cisco Unified Communications
Manager.
3 Audio server debug and capture logs are enabled for both phones. If
needed, enable Java debug.
Call statistics display does not show iLBC as the receiver/sender codec.
1 Check the following using the Cisco Unified Communications Manager
administration pages:
• Both phones are in the iLBC device pool.
• The iLBC device pool is configured with the iLBC region.
• The iLBC region is configured with the iLBC codec.
2 Capture a sniffer trace between the phone and Cisco Unified
Communications Manager and verify that SCCP
messages,OpenReceiveChannel, and StationMediaTransmit messages
have media payload type value equal to 86. If so, the problem is with
the phone; otherwise the problem is with the Cisco Unified
Communications Manager configuration.
3 Enable audio server debug and capture logs from both phones. If
needed, enable Java debug.
Troubleshooting